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I'd image that the ability to scan at such high resolutions would come in handy if you're wanting to blow up a very small portion of the scan. Seems to me that having more dpi to work with would give a shaper image of the enlarged portion of the picture. But it does eat up disk space
I had an interesting experience along that line. I was given a very small photo of myself, my wife, and our children taken 25 years ago. I wanted to use it as wallpaper on my desktop. Scanning it at a normal resolution level gave me boxes of color in place of pixels of the same color when I blew it up to screen size. Increasing the resolution made it a reasonable photo to display on the full screen. When scanning it is 